Draft-rigging.



w. M. PIPER.

DRAFT HIGGINS.'

(Application aleaumlpmox. ,'nunewed sept, 12, 1301.)

(No Model.)

2 Sheets-Sheet I.

le' 'i 'INVENTOR WITNESSES TN: Nonms P No. 693,332. Patented nu. n, |902.

, w M PIPER DRAFT. IIGiIIII.A mpplieltion led Jan. 16,1961'. Ranewed lo'pt.v 1.2, 1901.)

2 sheets-'sheet 2.

(llo Modal.)

4 t l. mvEn'Ton QNX: mouwen?.

u: uosmsmtrsns Mom-uma. wgsHlNoTon D c UNITED STATEs PATENT QEEICE.

VILLIAM MORGAN PIPER, OF ALLEGHENY, PENNSYLVANIA.

DRAFT-mesme.

SPECIFICATION forming part of Letters Patent No. 693,332, dated February 11, 1902. Application tiled January 16, 1901. Renewed September 12, 1901. -Serial No. 75.174. (No model.)

To @ZZ whom t may concern:

Be it known that I, WILLIAM MORGAN PI- PER, of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Draft-Rigging, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this speciication, in which- Figure l is atop plan View showing one form of draft-rigging constructed in accordance with my invention. Figs. 2, 3, and 4 are similar views showing a modified form. Fig. 5 is a broken sectional View showing the guiding of the pairs of blocks in the form of Fig. 4., and Figs. 6, 7, and 8 are diagrammatic plan views showing simpler forms of the invention.

My invention relates to the class of springpressed friction-blocks of draft-riggings, and is designed to improve this type of riggings by increasing the friction-surface and consequent resistance without additional parts or complicating of the rigging.

In the form of Fig. l, 2 2 represent the draftirons, and 3 is the draw-bar, having the yoke 4. 5 5 are transverse followers within the ends of the yoke and only resting against iiXed stops 6 6. Coacting with each follower 5 5 is a pair of wedge-blocks 7 7, having at one end curved faces which coact with correspondingly-curved faces upon the follower 8, interposed between the two sets of wedge-blocks. The blocks are normally forced apart by springs 9, and I prefer to use one spring for one set of blocks and a plurality of springs for the other set, -as shown.. The usev of the curved wedging-surfaces is of advantage in increasing the friction and making the parts easier to manufacture.

In the operation of the device, one of the end followers 5 being acted upon by the yoke actuates one set of wedge-blocks, and thus, through the follower 8, actuates the other set. The pairs of blocks move inwardly toward each other against the pressure of the springs and frictional resistance, the springs returning the parts to place when the strain is removed.

In Fig. 2 I show a form similar to that of Fig. 1, except that the end followers 5f are provided with concave curved faces acting upon similar convex faces on the wedgeblocks.

In the form of Fig. 3 the end followers 51J 55 are similar to those of Fig. 2,whi1e the intermediate follower is formed with fiat inclines coacting with similar flat inclined faces on the wedge blocks. In this form a single spring is used for each set of wedge-blocks.

In the form of Fig. 4 I show the parts arranged similarly to those of Fig. 2, except that all the followers are provided with curved, grooves in their friction-faces, within which fit end extensions 10 on the wedge-blocks, 65 thus further increasing the friction between the followers and the blocks. These guidin g-grooves may of course be used on anyone or more of the followers 5c or 8".

In Fig. 6 I show a simple form wherein only 7o two transverse blocks or followers 5d are employed with a single pair of wedge-blocks 7 d.

I haveshown the coacting friction-faces as curved in this figure and the transverse curved blocks as provided with stop-shoul 75 ders l', which prevent the inward movement of the wedge-blocks beyond a determined point, and thus preventthe danger of breaking the springs.

In Fig. 7 I show a formsimilar to that of 8o Fig. 6, except that the blocks are stopped in their inward movement by lugs or projections 12 on the wedge-blocks themselves, these lugs contacting with each other as the wedgeblocks reach the end of their travel.

In Fig. 8 I show a form in which one end follower 5k has fiat inclines, while the other has a curved incline. The wedge-blocks 7k are similarly shaped for the flat incline at the one end and the convex incline at the other. 9o

The advantages of my invention result from the use of the curvedinclines constituting the wedge-bases in place of the iiat incline previously used and, further, from the stops for limiting the movement of the wedge- 95 blocks and the use of the guiding-grooves in the transverse blocks.

Many variations may be made in the form and arrangement of the parts without departing from my invention.

I claim- 1. Ina draftrigging,a transverse block hav ing curved inclined faces, and spring-pressed wedge-blocks, having similarly-curved in clincs coacting` therewith; substantially as i follower having opposite inclined faces, and described. two pairs of oppositely-located spring-pressed 2. In draft-riggngs, a pair of end followers l wedge-blocks coacting with the above-named t5 and an intermediate follower, at least one of faces of the followers and arranged to move 5 which has curved inclined faces, and two toward and from each other transversely of pairs of wedge-blocks movable toward and the draw-bar axis; substantially as described. from each other between the followers and In testimony whereof I have hereunto set having curved faces coacting with the abovemy hand.

named curved faces; substantially as de- WILLIAM MORGAN PIPER. ro scribed. Witnesses:

3. In adraftrigging,apair of end followers GEORGE B. BLEMING, having inner curved faces, an intermediate VARREN W. SWARTZ. 

